论文信息 - Intra-annual changes in biomass, carbon, and nitrogen dynamics at 4-year old switchgrass field trials in west Tennessee, USA - 字舞流文

Intra-annual changes in biomass, carbon, and nitrogen dynamics at 4-year old switchgrass field trials in west Tennessee, USA

Abstract Switchgrass is a potential bioenergy crop that could promote soil C sequestration in some environments. We compared four switchgrass cultivars on a well-drained Alfisol to test for differences in biomass, C, and N dynamics during the fourth growing season. There was no difference (P > 0.05) among cultivars and no significant cultivar × time interaction in analyses of dry mass, C stocks, or N stocks in aboveground biomass and surface litter. At the end of the growing season, mean (±SE) aboveground biomass was 2.1 ± 0.13 kg m−2, and surface litter dry mass was approximately 50% of aboveground biomass. Prior to harvest, the live root:shoot biomass ratio was 0.77. There was no difference (P > 0.05) among cultivars for total biomass, C, and N stocks belowground. Total belowground biomass (90 cm soil depth) as well as coarse (≥1 mm diameter) and fine (

Robin L. Graham | Julie D. Jastrow | Roberto C. Izaurralde | Wilfried M. Post | Vanessa L. Bailey | R. M. Miller | Allison M. Thomson | Stan D. Wullschleger | Ronald D. Sands | Philip M. Jardine | W. M. Post | James E. Amonette | Charles T. Garten | F. B. Metting | Christopher W. Schadt | Melanie A. Mayes | Tristram O. West | Roser Matamala | A. Thomson | R. Sands | C. Schadt | D. Tyler | R. Miller | R. Graham | R. Izaurralde | J. Jastrow | J. Amonette | V. Bailey | P. Jardine | T. West | S. Wullschleger | R. Matamala | C. Gunderson | M. Mayes | F. Metting | J. Phillips | Jeffery L. Smith | H. Castro | Carla A. Gunderson | Donald D. Tyler | Deanne Jane Brice | K. Moran | Jana Randolph Phillips | Hector F. Castro | Marilyn K. Kerley | Kelly K. Moran | T. Vugteveen | D. Brice | M. Kerley | T. Vugteveen

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